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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Apr. 01, 2018 USD ($)	Dec. 31, 2017 USD ($) Supplier	Apr. 02, 2017 USD ($)	Dec. 31, 2017 USD ($) Supplier	Jan. 01, 2017 USD ($)	Jan. 03, 2016 USD ($)
Accounting Policies [Line Items]
Reporting period, minimum				364 days
Reporting period, maximum				371 days
Unrecognized tax benefits			$ 0
Cumulative effect adjustment to retained earnings			$ 0
Retained earnings		$ 112,424,000		$ 112,424,000	$ 124,363,000
Estimated gift card redemption period				20 quarters
Outstanding gift card liabilities		5,700,000		$ 5,700,000	5,300,000
Advertising expense, net of co-operative advertising allowances				37,900,000	38,200,000	$ 39,800,000
Co-operative advertising allowances				5,600,000	5,900,000	6,000,000
Cash equivalents		0		0
Long-lived assets to be held and used		500,000		500,000
Impairment of store assets		600,000		602,000	0	192,000
Self-insurance liabilities		11,600,000		11,600,000	11,600,000
Accrued interest or penalties		0		0	0
Cash deposits insured by the Federal Deposit Insurance Corporation		$ 250,000		$ 250,000
Concentration risk, suppliers | Supplier				700
Concentration risk, largest supplier | Supplier				20
Suppliers accounted for total purchases		40.90%		40.90%
Percentage of vendors represented greater than of total purchases				5.00%
Vendor represented greater than of total purchases | Supplier		1		1
One vendor [Member]
Accounting Policies [Line Items]
Suppliers accounted for total purchases		11.00%		11.00%
Accrued expenses [Member]
Accounting Policies [Line Items]
Self-insurance liabilities		$ 4,600,000		$ 4,600,000	4,700,000
Other long-term liabilities [Member]
Accounting Policies [Line Items]
Self-insurance liabilities		$ 7,000,000		7,000,000	6,900,000
Gift Card Breakage Revenue [Member]
Accounting Policies [Line Items]
Recognized gift card breakage revenue				$ 400,000	$ 400,000	$ 400,000
ASU No. 2014-09 [Member] | Scenario Forecast [Member]
Accounting Policies [Line Items]
Retained earnings	$ 700,000
Inventory cost	$ 1,300,000

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The maximum period for which financial information can be reported for the entity. Translates to a 53-week fiscal year, which can occur approximately every five years based upon the entity's calendar shift relative to the impact of a leap year on the entity's fiscal calendar and an extra day each year resulting from a 52-week fiscal year.

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Carrying value as of the balance sheet date of the liability for outstanding gift cards. Retail customers purchase gift cards or gift certificates that can be redeemed at a later date for merchandise or services; those unredeemed represent a liability of the entity because the revenue is being deferred.

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Total amount received by an entity from a vendor under a cooperative advertising arrangement that has been offset against advertising expense.

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